chore: periodic maintenance

[chaliy]

Summary

• Refresh OpenAPI spec and generated SDK schemas.
• Update dependency locks across SDKs and cookbooks.
• Add agent stats support across Rust, Python, and TypeScript SDKs.

Test Plan

• Tests pass locally: just pre-pr
• Coverage ≥80%
• Linting passes: just lint, just pre-push

Additional checks:

• cd rust && cargo build && cargo test
• cd python && uv sync --all-extras && uv run pytest
• cd typescript && npm ci && npm test
• just check-cookbook
• just lint-cookbook
• cargo audit
• uv export --all-extras --no-hashes | uvx --python 3.13 pip-audit -r /dev/stdin
• uv export --no-hashes | uvx --python 3.13 pip-audit -r /dev/stdin in cookbook/python
• npm audit in typescript and cookbook/typescript

Checklist

• Follows SDK API consistency guidelines
• Updated relevant specs (if applicable)
• Added/updated tests
• Updated documentation (if applicable)